linux-kernel - Re: [PATCH v5 7/8] Documentation: Add documentation for the Brute LSM

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Message-ID: <20210312175444.GC3103@ubuntu>
Date:   Fri, 12 Mar 2021 18:54:44 +0100
From:   John Wood <john.wood@....com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     John Wood <john.wood@....com>, Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        James Morris <jmorris@...ei.org>,
        Shuah Khan <shuah@...nel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v5 7/8] Documentation: Add documentation for the Brute LSM

On Thu, Mar 11, 2021 at 12:05:17PM -0800, Andi Kleen wrote:
>
> Okay but that means that the brute force attack can just continue
> because the attacked daemon will be respawned?
>
> You need some way to stop the respawning, otherwise the
> mitigation doesn't work for daemons.
>
I will work on your solution regarding respawned daemons (use wait*() to inform
userspace that the offending processes killed by the mitigation exited due to
this mitigation -> then the supervisor can adopt their own policy).

>
> -Andi
>

Thank you very much,
John Wood